I can tell your that the fan staying on the the idle issue are more than likely related. Your thermo valve is the origin of your issue and since it has been replaced I would be suspect of other components in this vacuum circuit. This circuit will not only affect fan operation but also idle speed as it is connected to the distributor, so you are on the right track. I woulld recommend checking the purge system for operation and vacuum line condition. The purge valve is located in the vacuum line between the charcol canister and the throttle valve housing, a control line is routed from the throttle valve housing through the thermo valve and on to the purge valve. Below is a diagram of the system:
It may be a bit hard to see put this in the image but this is the fuel evap system for your vehicle. To check the operation of this system do the following:
1. Dsiconnect the hose between the purge valve and the canister at the canister. No vacuum should be present at idle. The vacuum should gradually increase with engine speed
2. If no vacuum was present, trace the vacuum line back to the throttle valve housing. Blow through the connection on the housing and ensure the line is clear
3. If vacuum is still not present, remove the white/purple/black hose from the purge valve. If vacuum is now present replace the purge valve. If there is no vacuum the thermo valve is not operating.
Monday, May 4th, 2009 AT 12:13 PM